Cisco Systems C3850NM210G manual Resetting the Switch, Autonegotiation and Network Interface Cards

Chapter 6 Troubleshooting

Resetting the Switch

Autonegotiation and Network Interface Cards

Problems sometimes occur between the switch and third-party network interface cards (NICs). By default, the switch ports and interfaces autonegotiate. Laptops or other devices are commonly set to autonegotiate, yet sometimes issues occur.

To troubleshoot autonegotiation problems, try manually setting both sides of the connection. If this does not solve the problem, there could be a problem with the firmware or software on the NIC. You can resolve this by upgrading the NIC driver to the latest version.

Cabling Distance

If the port statistics show excessive FCS, late-collision, or alignment errors, verify that the cable distance from the switch to the connected device meets the recommended guidelines. See the “Cable and Adapter Specifications” section on page B-5.

Resetting the Switch

If you have configured a new switch with a wrong IP address, or if all of the switch LEDs start blinking when you try to enter Express Setup mode, you can clear the IP address that is configured on the switch.

Note Resetting the switch reboots the switch.

To reset the switch:

1.Press and hold the Mode button (Figure 1-2 on page 1-5).

The switch LEDs begin blinking after about 2 seconds. If the LEDs above the mode button turn solid green, you can release the Mode button and run Express Setup to configure the switch. If the LEDs do not turn solid green, continue with the next step.

2.Continue holding down the Mode button. The LEDs stop blinking after an additional 8 seconds, and then the switch reboots.

Alternatively, you can press the Reset button on the rear of the switch (approximately 5 seconds) to power cycle the switch.

You can also configure the switch by using the CLI setup procedure. See Appendix C, “Configuring the Switch with the CLI-Based Setup Program.”

Catalyst 3850 Switch Hardware Installation Guide

OL-26779-02 6-5